Re: aix, dlopen(NULL, .), and gcc

[Scott Dudley <scott at telesoft dot com>]

David Edelsohn wrote:

> >>>>> Scott Dudley writes:
>
> Scott> i'm using gcc 2.95.2 on aix 4.3.3 attempting to use the NULL path
> Scott> argument to dlopen().  i've gotten this to work flawlessly on linux but
> Scott> have been unsuccessful in my efforts to compile/link on aix.  below are
> Scott> listed two source files, main.c and foo.c.  i want to compile both into
> Scott> a.out and be able to use dlopen() and dlsym() to obtain a handle or
> Scott> pointer to foo().  following is excerpt from dlopen() manpage:
>
> Scott> If the value of FilePath is NULL, a value for the main application is
> Scott> returned. This allows dynamically loaded objects to look up symbols in
> Scott> the main executable, or for an application to examine symbols available
> Scott> within itself.
>
> Scott> can anyone tell me how to compile foo.c and ultimately, link both main
> Scott> and foo into a single executable?
>
>         For dlopen() [and the underlying AIX load()] functions to work,
> the symbols must be visible.  You either need to explicitly export the
> symbols you will inquire with GCC -Wl,-bE:symbols.exp where symbols.exp
> contains a single line:

that was it!  many thanks david.

>
>
> foo
>
> or use -Wl,-bexpall which will work in this case but may cause problems in
> more complicated settings.
>
> David

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